I my experience transit is usually enormously faster especially for downloads than the finder but particularly hugely more reliable. I had nothing but trouble with finder and dot mac, never works, files don't refresh, the worst I have to do in transit is log off, log on, in dot mac, I would have to restart the machine! or log out and log in it's the one feature that makes mac osx decidedly windows like in that respect, so I stopped using it and bought transit! In dot mac you can download one file at a time over broadband , in transit, if you drag each file individually (good for large files) I've downloaded up to 8 files simultaneously at about 80kbps for EACH FILE. If you do one, it gets up to 120kbps, so you can download a lot more data at once - not possible with finder. For example if you have 800mb of audio files - a big help. Uploads are still slow but more reliable that's for sure. In finder I always had big uploads or downloads fail, anything over 10mb is almost gauranteed to fail for me in finder, but transit I've done a file up to 250mb in a single file no trouble, I would be confident to do more than 1gig in a single file.
Miklos.